Tone arm



Jmm@26,l923.

F:OBERST TONE Aam Filed June 6, 1919 Patented June 26, 1923.

nir stares .1,459,143 PATENT ePrice.

FRANK OBERST, OF GLENDALE, NEW YORK,-ASSIGNOR TO SONORA PHONOGRAPH COB]-ronarron, A CORPORATION or NEW YORK.

TONE ARM.

Application led June 6, 1919. `Serial No. 302,105.

17 l0 all 012710772,trudyv concern K Be it known that I, FRANK OBERST, asubject of the Kingdom oifltumania, and residing at Glendale, in theborough of 6 Queens, county oi Queens, and Stateof New Yorluhaveinvented certain new and useful Improvements in rlone Arms, of whichythe following isa specification.

. `My invention relates to tone-arms for talking machines, and has forits objects to V provide means for facilitating the removal and renewingoff the stylus. y

A further object is thefproduction ot a tone-arm having relativelymovable members, and wherein rattlingl will be prevented and eliminated,and in which the various elements which go to malte up the tone-arm willbefrigidly secured. together and easily and readily assembled anddisassembled, and accidental. displacement avoided.

A' further object'of the invention is to produce a device of thecharacter described, which 4.is simple in construction, neat andattractive in appearance, thoroughly reliable '25 ande-fficient in itslpurpose, positive in operation, and inexpensive and economical tomanufacture.

With these and otherobjects in view to be more fully set forthhereinafter, the in vention consists `in the novel construction.

combination ofeleincnts and arrangement oif parts which will beexemplified in the construction hereinafter described in thespecification and `illustrated in the accom- )anvinc` drawings.considered together or l tn t? t;

separately. i i The invention will be first described in connection withthe accompanyingv drawings lillustratingy my invention, wherein similarLio reference characters are used to designate i `corresponding partsthroughout the several views, and then more speciiically defined andindicated in the appended claim.

In the drawings: Fig. 1 isa side elevation. partly in section, oftone-arm embodying` my invention;

Fig. 1a is a detailed sectional. view oi' the clamping means indicatedin Fig. l;

Fig. 2 is a section on the line 2-2 ot 5ogFg-1; c w Fig. 3 is a detailsectional view of a modi-` l cation, the section being indicated by theline 3-3 on Fig. 4; and

Fig. i is a section on the line 4-4 of Fig. 3. i i

In the embodiment of the invention illustrated, 1 designates the main`portion of a tubular tonenarm, which is `mounted to swing horizontallyonly on the motor board 2 of a talking machine cabinet. The free end ofthis main portion of the tone-arm 1 is provided with cylindrical barrel3, the

axis of which is at right angles to that of y the horizontal portion olfthe tone-arm, and in communication therewith. .i The barrel 3 is closedat one end by means of an `integral head 4f, and at` the opposite end isopen and internally screw threaded and closed by means of an externallyscrew threaded cap 5` which is threaded into the end oit' the barrelvandprovided with a milled edge flange 6 flush with and of, the samediameter as the outside of the barrel. One

side `of the barrel is :cut away as at 7, to

Jform a slot which extends approximately half way around the barrel. Theend of the tone-arm 1 to which the barrel is attached, is reduced indiameter. y Nithin the barrel isa cylindrical plugor swivel '9 having abore 10, therethrough. The diameter of the bore is equal to that of thediameter of the reduced end of the tonearm 1. Between the end of theswivel 9 and `the cap is disposed a washer 11 of felt or similar porousmaterial which is preferably saturated with oil or `a similar lubricant.

Carried within the bore 10 of the swivel y 9 is a tubular member 12which forms `an extension of the tone-arm.

The member 12.has a close t in the bore,

and a screw or pin 13 is passed through one end or the swivel and intothe member` 12.y

`whereby the swivel andmember areiirmly secured together. The free endof the member 12 carries a reproducer 14 provided with a stylus forengagementwith a record discv 15 carried on .a turn-table 16.

y 0n the inside Ot that end of the member i to engage a `perforation 20in the barrel `3 to lock the extension member 12 inthe elevated positionshownv in dotted lines in Fio. 1.

lan assembling the parts as above described the plug or swivel 9 isfirst tted or slid vinto yto Vnular chamber 2Q in the barrel.

inner end of the extension l2' with its attached spring and pin insertedthrough the slot inthe barrel-3 and" into the bore 10 of the plug orswivel 9, the pin 18 serving to limit the inward movement of theextension and to position the extension in the plug` or swivel, and thescrew 13 is then put in place through the open end of the barrel tosecure the extension l2 in place. rllhe washer l1 is then placed in thebarrel adjacent to the plug. or swivel and the cap 5 secured to placeagainst the washer to hold the partsin engagement to prevent rattling,and it will be observed that the cap maybe tightened up to take uplooseness in the joint which may be caused by use.

In the rmodification shown in `Figs. 3 and 4, one extremity of theswivel is reduced in diameter as at 2l, to form an an- Secured to thereduced portion 2l, and lying within the chamber 22 is a spring 23carrying a pin Q4 adapted to engage a perforation 25 in the barrel whenthe member l2 is elevated or in the position shown in Fig. t and indotted lineslin'Fig. l. rIhe perforationv 25 is preferably in theunderside of the barrel, as shown in Figs. 3 and il, and is thereforeinvisible or concealed from Sight.

Carried: onr the tone-arm l, in proximity to the vertical axisthereof isan arm 26 adapted to extend under the turn-table and 'engageand operatea trip for an automatic stop (not shown) for arresting the rotation ofthe motor and stopping the turntable. `The arm is carried on a stem 27which is provided with a cylindrical socket QS at itsupper end. Thesocket has a split side 29 and a screw 2() passes through a perforation3l to clamp the socket to a pin 3Q carried by the tone-arm. The lowerend of the pin is provided with a peripheral groove 33 with which thescrew engages to permit removal of the socket and at the same timepermit rotation of the socket relatively to the pin.

Itwill be understood that the constructionof tone-arm herein with theswivel eX- tension, and wherein' the main portion of the tone-arm isswiveled to the motor board oi' cabinet to have a horizontally uswingingmovement only, is yparticularly adaptable to `those talking machinespro.

videchwithan automatic stop or braking mechanism wherein the trippingmechanism for the stop'oi' brake is located beneath the turn-table,'aiid.it is necessary to provide an arm for operating said trip carried bythe tone-arm extending under the turntable,"thus making it undesirableto attach.

such-overating arm to a teneva-rm which is swivel d to the motor boardto have both a horizontal movement and a vertical adjustment, as suchoperating arm would prevent the lifting or vertical adjustment of thetone-arm in removing the stylus from the record and for other purposes.

In accordance with the provisions of the ciple of my invention togetherwith `the apparatus which I now consider to represent the bestembodiment thereof, but I desire it understood that my invention is notconfined to the particular form of apparatus herein shown and described,and, therefore,

I claim broadly the right to employ all equivalent instruinentalitiescoming within the scope of the appended claim, and by means of whichobjects of my invention are attained, and the new results accomplished,

vpatent statute, I have described the prinas herein set forth, as it isobvious that the Y particular embodiment herein shown and described isonly illustrative of my invention and that'other means can be employedto attain these objects and accomplish these results without ydepartingfrom the spirit of my invention. l

Having now described my invention, what I claim and desire to secure byLetters Patent is: i

A tone-arm for talking machines,`com

prising a horizontally swinging main porv tion providedfat its outer endwith a barrel having an integral'liead closing one end thereof and openand interiorly screwthreaded at its other end, said bairel having acircumferential slot, a swivel head having a radial bore and adapted tobe fitted endwise `in the barrel through the open end thereof, anextension for said tone-arm adapted to be inserted through the slot insaid barrel and detachably lixed in the bore of said swivel head, anabsorb-ent lubricant containing washer fitted in the open end of saidbarrel and engaging the end of said swivel head, and a plug cap for theopen end of said barrel having afreduced externally screwthreadedportion adapted to engage the interior-ly screwthreaded end of thebarrel to hold thel washer and swivel head in place and provided with amilled edge flange adapted to engage the edge of the barrel andsubstantially of the same diameter and flush with the outercircumference of the barrel. y

This specification signed and witnessed this 23rd day of May, 1919.

FRANK oBERsT.

